Networks, Systems and Methods for Routing Data Traffic Within a Telephone Network Based on Available Resources

ABSTRACT

When a subscriber calls into its Internet Server Provider(ISP), a central office receiving the call is triggered to perform a Local Number Portability (LNP) query. This LNP query is sent to an Intelligent Traffic Routing and Control (INTRAC) unit resident on a Service Control Point (SCP) which determines whether the call is to an ISP. If the call is to an ISP, the INTRAC unit polls a Remote Authentication Dial-In User Service (RADIUS) server to determine whether resources are available. The RADIUS server tracks the resources of the ISP and of other ISPs and informs the SCP of the available resources. The SCP then inserts the Local Routing Number (LRN) of the preferred resource into a reply that is sent to the central office. If resources are not available, the call is terminated before signaling occurs with any switch associated with the ISP. On the other hand, when resources are available, the subscriber can be directed to the preferred resource for the subscriber. The subscriber, for instance, can be directed to an access server within the ISP that has excess capacity or can be directed to an access server that provides the best service for the subscriber, whereby subscribers can be directed to X2 type service if they have an X2 modem or to K56Flex type service if they have a K56Flex modem. As another example, if one ISP is at maximum capacity, the subscriber can be directed to a second back-up ISP.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of copending U.S. patent Ser. No.10/637,178, filed Aug. 8, 2003, which is a continuation of U.S. patentSer. No. 09/132,961, filed Aug. 12, 1998, which issued as U.S. Pat. No.6,608,893 on Aug. 19, 2003. Both are entirely incorporated herein byreference.

FIELD OF THE INVENTION

The present invention relates generally to networks, systems and methodsfor routing data traffic within a telephone network and, moreparticularly, to networks, systems and methods for directing datatraffic away from the Public Switched Telephone Network and for routingdata traffic based on available resources and information about thestate of these resources.

BACKGROUND OF THE INVENTION

The Public Switched Telephone Network (PSTN) is the backbone forproviding telephony services to business and individuals in the UnitedStates. The PSTN includes a number of switches, generally designated asService Switching Points (SSPs), for interconnecting a calling party'sline to a called party's line. Prior to the 1960's, to complete a callbetween a calling party and a called party, signaling would occur overthe trunk circuits between the switches to ensure that the called partywas not busy and to establish a connection between the two parties. Thisearlier version of the PSTN was rather inflexible in that changes to thePSTN could only occur with the replacement of the hardware in the PSTN.For instance, at this time, the SSPs were hard-wired and had to bereplaced with a new SSP in order to update the switch's capability. Theswitches, however, could not be quickly updated since the standards andspecifications had to be well-defined for the various switch vendors. Toaddress the delays in updating switches, these hard-wired SSPs wereultimately replaced with SSPs that had stored program control (SPC). Asa result, rather than replacing an entire SSP, the SSP could be modifiedto enable a new feature simply by updating the software in the SSP. Evenwith SPC in the SSPs, the PSTN was still limited in the services that itcould provide.

A major advancement to the PSTN occurred in the mid-1970's with theintroduction of Signaling Transfer Points (STPs) and Signaling Systemnumber 7 (SS7) protocol. With the addition of SS7 and STPs to the PSTN,call setup information is routed over a signaling network formed betweenthe STPs and no longer occurred directly over the trunks. For instance,a calling party's SSP would send a data query from one of its associatedSTPs to an STP associated with the called party. The called party's STPwould then determine whether the called party's line was idle and wouldperform the necessary signaling over the SS7 data network to connect thecall. Thus, whereas before call setup signaling would occur over thevoice trunks, the STPs and SS7 signaling bypass this traffic away fromthe voice trunks and onto dedicated data lines. As a result, thecapacity of the PSTN to carry voice calls was greatly increased.

In the mid-1980's, demand for additional services from the PSTN resultedin the Intelligent Network (IN). In general, IN provides service logicexternal to the SSPs and places this logic in databases called ServiceControl Points (SCPs). To accommodate IN, the SSPs have software todetect service-specific features associated with IN. The software in theSSPs define hooks or “triggers” for the services that require use of anSCP. In response to a trigger, an SSP queries an associated SCP forrelevant routing information. For instance, IN permits 800 service andcalling card verification service, both of which require a query fromthe SSPs to the SCP through an STP and the return of routing informationto the SSP through an STP. A Service Management System (SMS) was alsointroduced into the PSTN with IN and provides necessary support inservice creation, testing, and provisioning. The SMS communicates withthe SCPs and provides software updates to the SCPs.

The demand for increased capabilities has more recently transformed theIN into an Advanced Intelligent Network (AIN). The AIN differs from theIN in that the AIN provides service independent capabilities whereas theIN was limited to service-specific capabilities. AIN provides a highlevel of customization and builds upon basic services of playannouncement, digit collection, call routing, and number translation.Some examples of AIN services include abbreviated dialing beyond acentral office, do not disturb service for blocking calls from certainnumbers or at certain times, and area number calling service whichallows a company to have one advertised telephone number but to havecalls routed to a nearest business location.

The ability to provide Local Number Portability (LNP) is perhaps thelatest enhancement to the PSTN. The local exchange carriers (LECs) arenow required under the Telecommunications Act to provide local numberportability so that subscribers can move or “port” their number from oneservice-provider to another service-provider. Traditionally, thefunction of a telephone number within the PSTN was both to identify thecustomer and to provide the PSTN with sufficient information to route acall to that customer. To allow a customer to change itsservice-provider while at the same time keeping the same telephonenumber, the telephone number can no longer by itself provide the meansto inform the network of the customer's location. A database, called aLNP database, stores routing information for customers who have moved orported to another local-service provider. The LNP database contains thedirectory numbers of all ported subscribers and the location routingnumber of the switch that serves them. With LNP, the SSPs will query anLNP database through a STP in order to correctly route calls to a portedtelephone number.

The evolution of the PSTN from providing POTS to AIN services hasprimarily been driven by the need to support voice telephony. The PSTN,however, is not limited to voice telephony but is increasingly beingrelied upon for data services. Modems are the predominant means data istransmitted over the PSTN. The integration of voice services with dataservices is not a new phenomenon and the PSTN has traditionallyaccommodated these combined services through its Integrated ServicesDigital Network (ISDN) lines. An ISDN line can carry both voice and datatraffic or can be optimized for data-only service at a speed of 128kbps. Although the ISDN has been available for close to 20 years, theuse of the ISDN line is not pervasive and estimates place the number ofInternet subscribers employing ISDN service at only 1.4 percent.

Despite the infrequent use of ISDN service, the need for data servicesis quite extensive. The PSTN has been designed to carry a large amountof voice traffic with each voice call lasting, on average, just a fewminutes. While an average voice call is approximately 3.5 minutes, theaverage Internet call lasts over 26 minutes. Considering that Internettraffic on the PSTN is soon expected to exceed the combined traffic ofboth voice and facsimile, the capacity of the PSTN will soon bestretched to its limits. The LECs have been meeting this higher demandfor capacity by deploying additional switches and other elements withinthe PSTN. Unfortunately for the LECs, the cost of this additional PSTNequipment is being born almost entirely by the LECs since they will seelittle increase in their customer base. This added expense to each LECis approximately $100 million per year and is thus a considerableexpense to the LECs.

An inunediate need therefore exists to alleviate strains on the PSTN dueto Internet traffic. Some solutions to handle Internet congestion havebeen proposed in the Bellcore White Paper entitled ArchitecturalSolutions To Internet Congestion Based on SS7 and Intelligent NetworkCapabilities, by Dr. Amir Atai and Dr. James Gordon. Many of thesesolutions discussed in this paper, however, require the design,development, and deployment of new network elements within the PSTN. Forinstance, several of the solutions introduce an Internet Call Routing(ICR) node which can perform SS7 call setup signaling and which is usedto direct Internet calls to a data network. Other solutions rely upon aRemote Data Terminal (RDT) to alleviate congestion while otherarchitectures propose the use of both ICRs and RDTs. The architecturesdescribed in the Bellcore White Paper are generally long-term solutionswhich offer limited assistance to the LECs in the near future. A needtherefore still exists for systems and methods for addressing theever-increasing amount of data traffic in the PSTN.

SUMMARY OF THE INVENTION

The present invention addresses the problems described above byproviding networks, systems, and methods for directing Internet callsand other data calls away from the Public Switched Telephone Network(PSTN). A call to an Internet Service Provider (ISP) triggers a query toa Service Control Point (SCP). When the query is received a the SCP, theSCP determines whether the called telephone number is a data call. If itis, the SCP routes an inquiry to an Intelligent Traffic Routing andControl Unit (INTRAC) which, according to one aspect of the invention,acquires routing directions and provides them to the SSP. The routingdirections are obtained through use of a resource table.

In the preferred embodiment, the SSP is triggered to perform a LocalNumber Portability (LNP) query to an SCP that performs LNP callprocessing. The SCP determines whether the call is a data call and, ifit is, directs the call away from an LNP call processing unit to theINTRAC unit. Both the LNP call processing unit and the INTRAC unit areService Package Applications (SPAs) that are resident on the SCP. TheSCP has a database of data-related telephone numbers and uses a RoutingKey to direct the query to the INTRAC unit. For queries related only toLNP, the calls are processed in the conventional manner and are noteffected by the INTRAC unit.

Instead of, or in addition to, receiving routing directions, the INTRACunit may also determine whether resources are available for connecting asubscriber's call to its destination. According to this aspect of theinvention, the INTRAC unit includes a resource table that may be updatedby an external or internal resource tracker. After receiving an LNPquery, the INTRAC unit determines from the resource table whether thecalled party has capacity to process the subscriber's call. If resourcesare available, the INTRAC returns the routing directions for thepreferred provider of the service within the Local Routing Number (LRN)of the LNP response. If service is not available, then the call to theISP is either redirected to another LRN or is intercepted, in which casethe subscriber receives a busy signal or other error treatment. As aresult, when resources are not available, the signaling between thesubscriber and the ISP provider is eliminated, thereby reducing trafficwithin the PSTN. On the other hand, when resources are available, thesubscriber can be directed to those resources in an efficient manner.

The resource tracker monitors the resources consumed by an ISP or groupof ISPs and may be either internal or external to the INTRAC unit. As anexample, the resource tracker defines a counter for each access serverwithin an ISP and sets the maximum value of the counter to the availableresources of that access server, such as the number of modems . Theresource tracker monitors the start and stop messages routed to a RemoteAuthentication Dial-In User Service (RADIUS) server and accordinglyadjusts the value of the counter to reflect the available resources. Theresource tracker adjusts values in the resource table to reflect thecurrent capacities of the ISPs. The INTRAC unit can therefore query theresource table in real-time to discover the available resources and, ifresources are not available, the call can be quickly re-routed orterminated.

In addition to allowing data calls to be intercepted when resources arenot available, data calls can also be more efficiently managed. Asubscriber's call, for instance, can be directed to a preferred Point OfPresence (POP) of an ISP or to a preferred access server within an ISP.The routing of the customer's call can be made based on geographiclocations or based on a preferred service for the subscriber, such asmodem (X2 or K56Flex) or ISDN service. The subscriber's call can also bedirected to the most appropriate ISP. For instance, when thesubscriber's ISP is at full capacity, the call may be directed to asecondary ISP that offers backup service to a preferred ISP.

One manner of controlling the destination of data calls is through theuse of Local Routing Numbers (LRNs). When an LNP query is sent from anSSP to the LNP SCP, the INTRAC unit associated with the LNP SCP providesthe LRN returned in the response to the SSP. This LRN may be obtained bythe INTRAC unit from the resource table or by an external resourcetracker. The external resource tracker or the INTRAC unit derives apreferred LRN based on the called party, and possibly also based on thecalling party. For instance, the information in the resource table canbe used to direct a subscriber's call to a preferred access serverwithin an ISP or even to an access server in a backup ISP.

Accordingly, it is an object of the present invention to providenetworks, systems, and methods for reducing traffic in the PSTN.

It is another object of the present invention to provide networks,systems, and methods for efficiently routing data calls.

It is a further object of the present invention to provide networkssystems, and methods for routing calls to a preferred resource withinthe ISP.

It is yet another object of the present invention to provide networks,systems, and methods for redirecting calls to a secondary resource whena first ISP is at peak capacity.

Other objects, features, and advantages of the present invention willbecome apparent with respect to the remainder of this document.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and form a part ofthe specification, illustrate preferred embodiments of the presentinvention and, together with the description, disclose the principles ofthe invention. In the drawings:

FIG. 1 is a diagram of a conventional network for providing data serviceto a subscriber;

FIG. 2 is a more detailed diagram of an Internet Service Provider andRADIUS server for the network shown in FIG. 1;

FIG. 3 is a diagram of a network according to a preferred embodiment ofthe invention;

FIG. 4 is a flow chart depicting a process of handling a subscriber'sdata call;

FIG. 5 is a flow chart depicting a process of generating an ISP resourceinquiry;

FIG. 6 is a flow chart depicting a method of monitoring consumption ofresources;

FIG. 7 is a diagram of a Common Channel Signaling System 7 (CCS7)message format;

FIG. 8 is a more detailed diagram of an Service Control Point accordingto a preferred embodiment of the invention;

FIG. 9 is a flow chart of a method of processing queries at the SCP ofFIG. 8; and

FIG. 10 is an example of a resource table according to a preferredembodiment of the invention.

DETAILED DESCRIPTION

Reference will now be made in detail to preferred embodiments of theinvention, non-limiting examples of which are illustrated in theaccompanying drawings.

I. Conventional Network

With reference to FIG. 1, the Public Switched Telephone Network (PSTN)10 provides local and long distance telephony service to itssubscribers, such as those represented by telephones 12, facsimilemachines 13, and computers 14. As discussed above, the PSTN 10 includesService Switching Points (SSPs), Signaling Transfer Points (STPs),Service Control Points (SCPs), and Service Circuit Nodes (SCNs), whichare collectively represented by the PSTN 10. The PSTN 10 also provides aconnection to the Internet 30, such as through an Internet ServiceProvider (ISP) 20. A subscriber using a computer 14 must direct a callthrough the PSTN 10 in order to gain access to his or her ISP 20, whichin turn provides access to the data network called the Internet 30. Thisarrangement of going through the PSTN 10 presents a number of problemsand challenges, some of which have already been described.

The PSTN 10, as shown in more detail. in FIG. 2, includes a number ofcentral offices (COs) 16 and tandem switches (T) 18. Typically, aplurality of subscribers are connected to a single central office 16 andthe central offices 16 are inter-connected to each other through one ormore tandem switches, such as the tandem switch 18. The ISP 20 has anAccess Server (AS) 22 connected to the PSTN 10 through a number lines,which are often primary rate ISDN (PRI) lines 24. The PRI lines 24extend between the ISP 20 and a single central office 16 within the PSTN10 and the ISP 20 is connected to the Internet 30.

The access server 22 in the ISP 20 includes a modem pool for linking itscustomers to the Internet 30. The ISP 20 has a need for a significantamount of administrative support in order to track and manage eachsubscriber's access to the Internet 30. A Remote Authentication Dial-InUser Service (RADIUS) server 40 provides this administrative support tothe ISP 20. The RADIUS server 40, in general, provides authentication,authorization, and accounting services for the ISP 20. A RADIUS servermay also provide routing and tunneling support in some implementations,which will become more apparent from the description below. When the ISP20 begins a session for a subscriber, the ISP 20 sends an authenticationrequest message to the RADIUS server 40 describing the subscriber forwhich the service is being provided. This message typically alsoincludes the subscriber's name and the subscriber's password. Uponreceipt of the authentication request message, the RADIUS server 40sends an acknowledgment that the message has been received withauthentication results. The RADIUS server 40 verifies the subscriber'sname passed from the access server 22 and the password and also returnsconfiguration information to the access server 22 for that particularsubscriber. If authentication is successful, a start accounting messageis sent to the RADIUS server 40. At the end of a session with asubscriber, the access server 22 sends a stop message indicating thetype of service that was delivered and possibly other information, suchas elapsed time. The services that may be provided to the subscriberinclude SLIP, PPP, Telnet, or rlogin. Additional information on theRADIUS server 40 may be found in Rigney et al., Remote AuthenticationDial-In User Service (RADIUS), Network Working Group, January, 1997, orin Rigney et al., RADIUS Accounting, Network Working Group, April, 1997.

One challenge facing the ISP 20 is striking a balance between efficientutilization of its resources and providing capacity to meet subscriberdemand. The resources of the ISP 20 is predominantly its pool of modemsand the ISP 20 tries to minimize this cost by ensuring that all of itsmodems operate at peak capacity. To provide a quality service to itssubscribers, on the other hand, the ISP 20 should ideally be able toprovide access to the Internet 30 for each subscriber whenever he or shewants and should strive to provide each customer with maximum bandwidth.The ISP 20 typically strikes this balance by attempting to closely shapeits capacity to customer demand and by reducing transfer speeds whendemand for services increases. Due to the difficulty in estimatingcustomer demand and due to fluctuations in the demand and in thesubscriber base, the ISP 20 is often operating at peak capacity and isunable to accommodate any more calls from its subscribers.

This difficulty in reaching the ISP 20 can be problematic for both theISP 20 as well as for the Local Exchange Carrier (LEC). For the ISP 20,the subscriber is likely frustrated that he or she cannot reach the ISP20 and may decide to discontinue service with the ISP 20 and sign upwith another ISP that can offer better quality service. Even when thesubscriber is able to connect with its ISP 20, the subscriber is oftenfrustrated by the limited amount of available bandwidth and to theresultant slow transfer speeds. For the LEC, a subscriber who cannotinitially make contact with its ISP 20 often repeatedly attempts to makecontact with the ISP 20 and may continue to do so until communicationsare established. Each time that the subscriber attempts to contact hisor her ISP 20, the subscriber consumes valuable resources of the PSTN 10since each call requires a considerable amount of processing andsignaling within the PSTN 10, including signaling between an SSP and STPassociated with the subscriber and between an SSP and STP associatedwith the ISP 20. Additional resources of the PSTN 10 may also beconsumed if queries are sent to an SCP, such as when the subscriberdials a 1-800 number to reach the ISP 20. A need therefore exists for away of more efficiently controlling and managing the resources of an ISPand of the PSTN.

II. Network Overview

A network 100 for more efficiently controlling and managing resources ofan ISP and of the PSTN is shown in FIG. 3. The network 100 includessubscribers having computers 14 who are provided Internet access throughone or more ISPs. Each computer 14 is connected to one of the centraloffices 16 within the PSTN. As shown in FIG. 2, a number of subscriberswith computers 14 are connected to one of the central offices 16 withinthe PSTN 10. The central offices 16 and the tandem switch 18 areconnected to one or more access servers 22, preferably through PrimaryRate ISDN lines (PRI). The central offices 16 are also connected to anSCP 42 which provides Local Number Portability (LNP) services to thePSTN 10. The network 100 additionally includes an Intelligent TrafficRouting and Control (INTRAC) unit 45 connected to the SCP 42 and aresource tracker 50 connected to the RADIUS server 40. Although theINTRAC unit 45 is illustrated as a separate item from the SCP 42, asdescribed in more detail below, the INTRAC unit 45 preferably resides onthe SCP 42 as a Service Package Application (SPA).

As described above, one application of a RADIUS server providesauthentication, authorization, and accounting services to the ISP 20.This first application of a RADIUS server is typically associated with asingle ISP 20 and is a Level 2 Tunneling Protocol (L2TP) Network Server,commonly referred to as an LNS. A second application of a RADIUS server,such as RADIUS server 40′ shown in FIG. 3, generally provides routingand tunneling support for an LEC. This application of RADIUS server 40′is an L2TP Access Concentrator, commonly referred to as a LAC. Afterreceiving a call from a subscriber, an Access Server 22 queries theRADIUS server 40′ for level 2 tunneling information. In response to oneof these queries, the RADIUS server 40′ determines how to route the callthrough the LEC's Wide Area Network (WAN) 26 so that the call reachesthe proper destination with the Internet 30. The WAN 26 may comprise anysuitable type of network, such as a frame relay or Asynchronous TransferMode (ATM). Upon reaching an ISP within the Internet, such as AOL, theISP has its LNS RADIUS server 40 for providing the authentication,authorization, and accounting services.

The network 100 is not limited to the RADIUS server 40′ but mayencompass other types of servers and is preferably a DIAMETER server40′. The DIAMETER protocol is an enhancement to the RADIUS protocol andis backward compatible with the RADIUS protocol. The RADIUS protocol hasa limited command and attribute address space and is not in itself anextensible protocol. The RADIUS protocol, furthermore, assumes thatthere are no unsolicited messages from a server to a client. TheDIAMETER protocol, on the other hand, supports new services and permitsa server to send unsolicited messages to clients on a network As aresult, the RADIUS server 40′, if implemented as a DIAMETER server 40′,supports messages from it to any of the Access Servers 22. This allowsthe acquisition of additional state information applicable to theresource tracker. Various proprietary “DIAMETER”-like client/serverapproaches may also be used with the invention.

While FIG. 3 depicts access servers 22, the ISP is not delineated in thefigure for reasons that will become apparent from the followingdescription. As explained in more detail below, the access servers 22Ato 22C may be operated by a single ISP or by multiple ISPs. Furthermore,the ISPs may not operate the access servers 22 but instead may have adata connection to the PSTN 10, with the circuit to packet adaptationbeing performed through the access servers 22 by a different entity,such as by a Local Exchange Company (LEC). Thus, the data calls intendedfor an ISP may be packetised prior to being delivered to the ISP. Afirst ISP, for instance, may be connected to the output of access server22A, a second ISP may be connected to the output of access server 22B,and a third ISP may be connected to the output of access server 22C. Asingle ISP, of course, may be connected to more than one access server22, whereby a single ISP may be connected to the outputs of all accessservers 22A to 22C.

The network 100 also includes a resource table 43. As will be explainedin more detail below, the resource table 43 may be connected to theINTRAC unit 45 or may instead be connected to the resource tracker 50.Furthermore, although the resource table 43 has been shown as a separateelement, the resource table 43 may be incorporated in and form a part ofthe INTRAC unit 45 or the resource tracker 50. The connections betweenthe resource table 43 and both the INTRAC unit 45 and resource tracker50 have therefore been shown in dashed lines since the resource table 43is not limited to its illustrated location.

III. INTRAC

An operation according to one embodiment of the invention of the network100 will now be described with reference to FIG. 4. At a step 61, asubscriber initiates a call to its ISP through computer 14 and initiatesa call to its ISP through one of the central offices 16. At step 62, thecentral office 16 receives the called number from the subscriber and istriggered to send a query to an SCP. This query is passed through an STP41 to the SCP 42.

At step 63, the SCP 42 receives the query from the central office 16through the STP 41. and determines whether the resource tracker 50should be queried. According to one aspect of the invention, the INTRACunit 45 does not query the resource tracker 50 but instead processingcontinues at step 64 with the INTRAC unit 45 retrieving routingdirections for the ISP directly from the resource table 43. Theserouting directions are returned in a response to the central office 16at step 68.

The INTRAC unit 45, based on the reply from the resource table 43,determines whether sufficient resources are available at step 66 andformulates an appropriate response to the SCP 42. This appropriateresponse contains routing directions for directing the call to apreferred location within the PSTN. If the response from the resourcetable 43 indicates that sufficient resources are available, then theINTRAC unit 45 at step 68 returns a response to the central office 16which contains the routing directions. On the other hand, if resourcesare not available, then the INTRAC unit 45 at step 67 will return aresponse to the central office 16 terminating the call, such as byproviding a busy signal to the caller.

In the preferred embodiment, the central office 16 performs an LNPtrigger and sends an LNP query to the SCP 42. The routing directionsreturned in the response from the INTRAC unit 45 at step 68 preferablycontains the Local Routing Number (LRN) for where the subscriber's callshould be routed. Through use of the LNP trigger, LNP query, and LRNs,calls to an ISP and other data-related calls can be directed away fromthe PSTN 10 and onto dedicated trunks for data calls. As shown in FIG.3, for instance, each SSP or central office 16 is directly connected toan access server 22 and the LRN directs the subscriber's call to a trunkgroup interconnecting the central office 16 to the access servers 22.

The signaling between the SCP 42 and the STP 41 and central offices 16is not altered with the invention. The signaling to and from the SCP 42conforms to Signaling System 7 (SS7) and appears as a typical LNPinquiry and response.

At step 64, the INTRAC unit 45 retrieves the routing directions in anysuitable manner. The INTRAC unit 45 preferably uses the resource table43 which holds the LRNs for each ISP. When the INTRAC unit 45 receives aquery from an SSP 16, the INTRAC unit 45 performs a look-up function inthe resource table 43 to find the appropriate LRN for the calledtelephone number and returns the LRN in a response to the LNP query atstep 68.

IV. Resource Tracker

According to another aspect of the invention which involves the resourcetracker 50, the INTRAC unit 45 formulates a resource query at step 65.The resource query, as will be described in more detail below, is aquery sent from the INTRAC unit 45 to the resource tracker 50 to inquireas to the resources available for the subscribers call. The resourcetracker 50 receives the resource query and, in response, checks theavailable resources of the ISP. Based on its evaluation of ISP resourcesthrough its connection to the RADIUS server 40′, the resource tracker 50returns an appropriate response to the INTRAC unit 45 with informationabout the available resources at step 66. According to this embodiment,the resource table 43 is managed by the resource tracker 50. In responseto receiving the resource query, the resource tracker 50 consults withthe resource table 43 to find a preferred LRN for the subscriber's call.

The signaling between the access servers 22 and the RADIUS server 40′ isnot changed with the invention. The access servers 22 communicate withthe RADIUS server 40′ according to the RADIUS accounting protocol, orother suitable protocols. The resource tracker 50 preferablycommunicates with the INTRAC unit 45 according to GR1129-CORE, asignaling protocol defined in AIN 0.2, although other protocols may beused, such as 1129+, 1129A, TCP/IP, or another protocol.

V. Call Routine

Regardless of how the INTRAC unit 45 obtains the LRN, the LRN isprovided to the switch to direct the call to a preferred location ortrunk group. The LRN, for instance, may redirect the subscriber's callto a different location or, alternatively, simply contains the sametelephone number called by the subscriber. The INTRAC unit 45 thereforemay rely upon the resource tracker 50 to redirect calls, to determinewhether resources are available to connect the subscribers call, or todetermine whether the subscriber's call should be terminated.

One advantage of the network 100 over the conventional network shown inFIG. 2 is that ISPs no longer need to have a concentrated Point ofPresence (POP). Typically, as shown in FIG. 2, an ISP 20 is connected tothe PSTN 10 through a single egress switch such as central office 16,through PRIs 24. This concentrated POP for the ISP 20 renders itdifficult and expensive to relocate the ISP 20 to another location, bothfor the ISP 20 and for the LEC. For the LEC, moving an ISP from onelocation to another location is tremendously expensive since the LECmust build the infrastructure necessary to support the ISP at the newlocation and the investment at the old location must be dismantled at agreat loss to the LEC.

The network 100 shown in FIG. 3, in contrast, does not require the ISPto have a concentrated POP. Rather than directing all calls to an ISPthrough a single central office 16, each SSP 16 in network 100preferably has a direct connection to the ISP through one of the accessservers 22. The LRN returned to the SSP therefore directs the SSP to aspecified trunk or trunk group in order to route the data call to theaccess servers 22. The connections between the SSPs and the accessservers are preferably PRI lines. By directing calls from each ingressswitch to the access servers 22 and away from the PSTN, costs associatedwith handling data calls are substantially reduced. For the ISP, the useof LRNs to route calls from their subscribers offers flexibility in howthe ISPs network are built and distributed, both from a viewpoint oftiming and geography.

VI. Resource Query

A process 70 for generating the resource query at step 65 of FIG. 4 willnow be described with reference to FIG. 5. The process 70 explains inmore detail steps that occur after a determination has already been madeby the INTRAC unit 45 that a query should be sent to the resourcetracker 50. At a step 71, after the INTRAC unit 45 receives the queryfrom the SSP, the INTRAC unit 45 sends a resource query to the resourcetracker 50. The resource query includes the called telephone number,thereby designating the ISP, and may also include the calling party'stelephone number, thereby designating the subscriber. At step 72, theINTRAC unit 45 receives a response from the resource tracker 50 anddetermines, at step 73, whether to generate any additional resourcequeries. These additional resource queries, as discussed in more detailbelow, may query the resource tracker 50 as to the available resourcesof other access servers or other ISPs. The additional resource queries,moreover, may query the resource tracker 50 as to preferred resourcesthat are available for a particular subscriber. If additional queriesare made, then processing returns to step 71 where the resource query isformulated and to step 72 where the response is received from theresource tracker 50.

When no more resource queries are needed, the INTRAC unit 45 at step 74evaluates the resources available to the subscriber. This evaluationfocuses, according to established criteria, on the most desired accessserver, the most desired ISP, or other factors that are influential indirecting the subscriber's call. At step 75, the INTRAC unit 45 issuesan appropriate reply to the central office 16. If resources areavailable for the subscriber, then the reply sent to the central office16 includes the LRN for routing the subscriber's call.

The evaluation of resources may alternatively be performed by theresource tracker 50 instead of by the INTRAC unit 45. The INTRAC unit 45sends the resource query to the resource tracker 50 with this querycontaining the called telephone number and possibly also the callingparty's telephone number. The resource tracker 50 selects the desiredLRN for the subscriber's call based on decision-tree routing storedwithin the resource tracker 50. This decision-time routing can becustomized for an ISP, an LEC, or other entity. The resource tracker 50checks the telephone number called by the subscriber and return aresponse indicating whether resources are available at that number. Theresource tracker 50 may perform additional processing and find anoptimal LRN for the subscriber based on the called telephone number andpossibly also based on the calling party's telephone number. Anadvantage of having the evaluation of resources performed at theresource tracker 50 is that the resource queries and the responses tothese queries can be eliminated.

VII. Tracking Resources

A method 80 for tracking the resources of an access server or ISP at theresource tracker 50 will now be described with reference to FIG. 6. At astep 81, the resource tracker 50 sets the maximum value of a counter tothe peak capacity of the access server or ISP, or other desired maximum.As an example, if the ISP has 100 modems available, the resource tracker50 sets the counter to a value of 100. At step 82, the resource tracker50 determines whether a change in a session has occurred. The RADIUSserver 40′, as discussed above, receives start and stop messages fromthe access servers and ISPs when sessions begin and when they terminate,respectively. The resource tracker 50 monitors these start and stopmessages and determines that a change in a session occurs when either ofthese messages is received. At step 83, the resource tracker 50determines whether a session has started and, if so, decrements thecounter at step 84. At step 85, the resource tracker 50 determineswhether a session has stopped and, if so, increments the counter at step86. The process 80 returns to step 82 to detect the next change in asession. The available resources of each ISP are stored in the resourcetable 43. This functionality remains the same whether the ISP'sresources are provided by a single Access Server or multiple AccessServers dispersed across a wide geographical area.

In general, through the method 80 and counters, the resource tracker 50tracks the number of available resources and reduces the value in thecounter for each new session that has started. Conversely, when asession terminates, the resource tracker 50 increments the counter toreflect new resources that have become available to the network 100.According to one aspect of the invention, the resource tracker 50 has acounter for each ISP that it is monitoring and each counter reflects thetotal number of resources available for that ISP. According to a furtheraspect of the invention, the resource tracker 50 has a plurality ofcounters for each ISP with each counter reflecting the availableresources within part of the ISP. Each counter, for instance, may bededicated to a single Point Of Presence (POP) managed by the ISP with asingle ISP having plural POPs. As another example, each counter may bededicated to a single access server within an ISP. One access server,for instance, may provide K56 service and a second access server mayprovide K56Flex service to its subscribers while yet another may offermore recently developed modem techniques, such as V.90. Other uses andexamples of the counters for tracking and monitoring resources of an ISPwill become apparent to those skilled in the art.

The resources of the ISP can alternatively be monitored through the SCP42 and INTRAC unit 45. Through monitoring of call set-up signaling andtermination notification signaling to the ISP, the INTRAC unit 45determines the resources available at the ISP. The INTRAC unit 45, basedon this determination, then updates the resource table 43 to reflect theavailable resources.

VIII. Data Signaling

A preferred method of directing a subscriber's call to the INTRAC unit45 will now be described. When the subscriber's call is received at theSSP 16, the SSP 16 determines that the call is to a local number and istriggered to perform an LNP query. In general, queries passed from anSSP to an SCP and responses from the SCP to the SSP pass through aCommon Channel Signaling System (CCS7) network that includes the STPs. ACCS7 message is comprised of three parts: an MTP part that contains theRouting Label, an SCCP part that contains the Global Title (GT), and adata field. The data for a call setup is defined as ISDN User Part(ISUP) data and data for database services is defined as TransactionCapability Application Part (TCAP) data.

An explanation will first be given for the signaling that occurs when asubscriber calls a ported telephone number which requires LNP callprocessing. The SSP 16 receiving the call inserts its point code inOriginating Point Code (OPC) 96 and inserts the capability of a localSTP 41 pair in the Destination Point Code (DPC) 97, with the OPC 96 andDPC 97 together forming the Routing Label for the query 90. The CalledParty Address 94 of the query 90 includes a Global Title (GT) which theSSP 16 populates with the ten-digit dialed telephone number and alsoincludes a Sub-System Number (SSN) which the SSP 16 populates with allzeros. In a Calling Party Address 93 part of the SCCP 92, the SSP 16inserts the point code for the SSP 16 and the AIN 0.1 Sub-System Numberfor the SSP 16. The TCAP 91 part of the query 90 includes a TransactionID (TID) identifying the call, a Trigger Type (TT) identifying the typeof trigger detected by the SSP 16, and a Service Key (SK) equal to theten-digit dialed number. The STP 41 receives this query 90 and performsa Global Title Translation (GTT) and changes the Routing Label 95 beforesending the query 90 to the SCP 42 that performs LNP call processing.

An explanation of call signaling according to a preferred embodiment ofthe invention will now be provided. When a subscriber call its ISP orotherwise makes a data call, the SSP 16 receiving the call performs anLNP query 90 when the call is to a local number. The LNP query 90,according to standard LNP call processing, is passed to the STP 41 forGlobal Title Translation and the STP 41 launches a reformatted query 90to the SCP 42 for processing.

In contrast to a conventional LNP query 90, though, the LNP query 90according to the invention is rerouted when the call is a data call. Adiagram of the SCP 42 and a method 100 according to a preferredembodiment of processing the query 90 at the SCP 42 will now bedescribed with reference to FIGS. 8 and 9, respectively. The SCP 42includes a Service Package Manager 102 for receiving queries from theSTP 41 through the CCS7 network, a database 103, the INTRAC unit 45, andan LNP processing unit 104. In the preferred embodiment, the INTRAC unit45 and the LNP processing unit 104 are each a Service PackageApplication (SPA) within the SCP 42 and share the same SSN andtranslations type. At a step 111, the Service Package Manager 102 withinthe SCP 42 receives the query 90 from the STP 41 through the CCS7network. The Service Package Manager 102 at step 112 compares the dialedtelephone number in the Called Party Address 93 field of the query 90 tonumbers stored in database 103 to determine whether the call is a datacall, such as to an ISP. The telephone numbers identifying data callsare preferably collected at a central location and downloaded to thevarious SCPs 42 through a Service Management System 107.

If the dialed telephone number does not identify the call as a data callby the primary Routing Key, then at step 113 the Service Package Manager102 generates a default Routing Key and passes the call for LNP callprocessing. A Routing Key is comprised of an SSN, a Trigger Type, and aService Key. The SSN in the Routing Key typically is populated by an SCPwith the SSN in the SCCP Called Party Address, and the Trigger Type andService Key are both acquired from the TCAP part of the query 90. Atstep 113, the Routing Key is generated in the conventional manner and atstep 114 standard LNP call processing is performed by the LNP processingunit 104. The LNP processing unit 104 performs a look-up function in adatabase 105 and inserts the LRN of an SSP 16 serving the called partyin the Called Party Address 94 and inserts the actual called-partytelephone number is placed in a Generic Address Parameter (GAP) field.For an LNP query that does not involve a data call, the LNP callprocessing is not effected by the INTRAC unit 45 and signaling withinthe PSTN occurs in the standard way.

In contrast, when the Service Package Manager 102 finds a match betweenthe dialed telephone number and an entry in the database 103 at step112, then the Service Package Manager 102 generates a Routing Key atstep 115 specific for the INTRAC unit 45. This Routing Key contains thesame Trigger Type and Service Key as those in the Routing Key generatedat step 113 for a call that should be routed to the LNP processing unit104. The SSN populated by the Service Package Manager 102 at step 115 isa SSN unique to the INTRAC unit 45. Based on the Routing Key, the SCP 42passes the query 90 to the INTRAC unit 45 at step 116 for furtherprocessing. The INTRAC unit 45, as with the LNP processing unit 104,inserts a preferred LRN in the Called Party Address 94, with this LRNbeing obtained directly from the resource table 43, either through alook-up function or through the resource tracker 50. Although theresource table 43 has been shown separately from the SCP 42, it shouldbe understood from the description above that the resource table 43would preferably be a real-time database on the SCP 42. The resourcetable 43, for instance, may form a part of the database 105.

IX. Resource Table

A preferred example of the resource table 43 is shown in FIG. 10. Theresource table 43 includes a customer identification number uniquelyidentifying a particular ISP. Although only two customer IDs have beenshown in FIG. 10, the resource table 43 typically contains a greaternumber of customer IDs. For each customer ID, the resource table 43includes a number of telephone numbers assigned to that ISP with thesetelephone numbers being represented by telephone numbers 1, 2, . . . N.The resource table 43 further includes an entry for the volume of callspermitted to that ISP, such as 50 calls, and the present number ofactive calls. The resource table 43 may also include an entry enablingthe routing of overflow calls and also one or more entries designatingthe LRNs for overflow calls.

With resource table 43, the resource tracker 50 or INTRAC unit 45 caneasily derive appropriate routing directions for a subscriber's call. Bychecking the peak volume of the ISP and the number of active calls, theresource tracker 50 or INTRAC unit 45 can determine whether calls can berouted to that ISP. If the ISP is at peak capacity, then the resourcetracker 50 or INTRAC unit 45 checks whether overflow capacity is enabledand, if so, where the call should be routed. The customer identificationand overflow routing can be contained within a single ISP or mayencompass a multitude of ISPs. A single ISP, for instance, may have aplurality of “customer” identification numbers with each customer IDrelating to a separate class of service. In this manner, the resourcetracker 50 or INTRAC unit 45 performs processing based on the desiredclass of service for a subscriber. The overflow according to thisarrangement directs calls to a less desired type of service within theISP or to other ISPs offering that service. The customer IDs may insteadbe dedicated to different POPs of an ISP with subscribers preferablybeing directed to the closest POP and with overflow calls being directedto other POPs of the ISP. Instead of directing calls to another POP ortype of service within a single ISP, the overflow may direct calls to asecondary or back-up ISP. As will be appreciated by those skilled in theart, the resource table 43 can be configured in various other ways andshould not be limited to the example shown in FIG. 10.

X. Network Configurations

Based on the descriptions above, the network 100 can be configured in amultitude of ways, depending upon the specific application. According toone aspect of the invention, the network 100 does not include theresource tracker 50 and the INTRAC unit 45 does not perform any resourcequery. Instead, the INTRAC unit 45 receives queries from thesubscriber's SSP, derives a desired LRN from the resource table 43, andinserts the desired LRN in a response returned to the SSP. The INTRACunit 45 may simply look up the LRN in the resource table 43 or mayperform some processing of information in the resource table 43 beforearriving at the desired LRN.

According to another embodiment of the invention, the INTRAC unit 45 andSCP 42 may monitor the resources of the ISPs. As discussed above, theINTRAC unit 45 tracks the resources available in an ISP by monitoringcall set-up signaling and termination notification signaling. The INTRACunit 45 can therefore direct the subscriber's call to a preferred LRNand can also terminate the call if resources are not available.

According to another aspect of the invention, the network 100 includesboth the INTRAC unit 45 and the resource tracker 50. The resourcetracker 50 determines whether the call initiated by the subscriberthrough computer 14 should be routed to the ISP or should be interceptedbased on the available resources. The resource tracker 50 determineswhether the ISP has resources available for the subscriber and generatesan appropriate reply to the INTRAC unit 45 at step 66. If resources areavailable, the call is completed in its usual manner through the PSTN 10to the access server 22. If, on the other hand, resources are notavailable at the ISP, then the subscriber's call is intercepted beforefurther signaling occurs within the PSTN 10 and the subscriber receivesa busy signal at step 67. The network 100 according to this aspect ofthe invention connects the subscriber to the ISP or intercepts the calland is able to reduce signaling within the PSTN.

According to a further aspect of the invention, the network 100 includesboth the resource tracker 50 and INTRAC unit 45 and the resource tracker50 returns a LRN to the INTRAC unit 45. As discussed above, the LRNreturned by the resource tracker 50 is chosen from the resource table 43based on any suitable criteria. In one example, the resource tracker 50selects the LRN based on a preferred access server 22. With reference toFIG. 3, the access server 22 comprises a plurality of access servers22A, 22B, and 22C. When a subscriber calls in to any one of these accessservers 22A, 22B, or 22C, an LNP query is initiated at the centraloffice 16 and a resource query is generated by the INTRAC unit 45. Theresource tracker 50, according to this example, tracks the resourcesavailable for each of the access servers 22A, 22B, and 22C through oneor more counters. The resource tracker 50 includes the LRN in itsresponse to the INTRAC unit 45 so that the subscriber is directed to anaccess server 22 that has excess capacity. For instance, if the accessserver 22 called by the subscriber is at peak capacity or is presentlyconsuming more than a certain threshold of capacity, the resourcetracker 50 and INTRAC unit 45 direct the subscriber's call to the accessserver 22 having excess capacity. As an example, an initial call fromcomputer 14 to access server 22A is redirected to access server 22C whenaccess server 22A is at peak capacity and access server 22C has excesscapacity. After the access server 22 with excess capacity has beenlocated, the INTRAC unit 45 inserts central office 16 through the STP41. To the central office 16 and the PSTN 10, the telephone numbercalled by the subscriber appears to have been a ported number and thePSTN 10 provides the appropriate LRN for the subscriber's call.

The criteria used in selecting the preferred LRN is not limited to aparticular access server within a single ISP, but rather may be used toallocate resources between two or more .ISPs. For instance, whenresources for a first ISP are at peak capacity or above a certainthreshold level of capacity, the INTRAC unit 45 redirects calls awayfrom that first ISP to a second ISP having excess capacity. The resourcequeries sent from the INTRAC unit 45 are therefore concerned not onlyabout the capacity within the first ISP but can also look to theresources of other ISPS. Thus, for instance, if MindSpring is at peakcapacity, the INTRAC unit 45 and resource tracker 50 can redirectMindSpring subscribers to a secondary ISP, such as BellSouth.net.

Instead of, or in addition to, the criteria of access server and ISP,the LRN may be selected based on particular information concerning thesubscriber. According to this example, the resource tracker 50 andINTRAC unit 45 direct a subscriber to a preferred resource for thatparticular subscriber. The RADIUS server 40′, as discussed above,contains configuration information on each subscriber to an ISP,including information on the type of service that the subscriber isconfigured for with the ISP. The INTRAC unit 45 and resource tracker 50can thus find an access server or ISP that offers the preferred serviceor resource for that subscriber. As an example, for a subscriber havingan X2 modem, the LRN selected by the INTRAC unit 45 and resource tracker50 directs the subscriber's call to a resource that provide X2 service,rather than the K56Flex service. The INTRAC unit 45 and resource tracker50 preferably first check the resources of the access server 22 calledby the subscriber, followed by other access servers 22 managed by thesubscriber's ISP, and then to other ISPs, if enabled, that can offerservice for that subscriber. The configuration information used by theINTRAC unit 45 and resource tracker 50 in directing the subscriber'scall is not limited to modem type but may encompass other types ofinformation, such as the type of service delivered to the subscriber.Also, additional information may be stored in the RADIUS server 40′ andused by resource tracker 50 in directing calls within the PSTN.

The evaluation of the best LRN for a subscriber can be performed by theresource tracker 50, the INTRAC unit 45, or both the resource tracker 50and INTRAC unit 45. The invention is not limited to having the selectionbeing performed only by the INTRAC unit 45 but instead encompasses theselection being performed by the resource tracker 50 or the selectionbeing shared by the resource tracker 50 and INTRAC unit 45.

According to a further aspect of the invention, the resource tracker 50automatically sends updates to the INTRAC unit 45 upon a change inresources for an ISP or at a predetermined period of time or set time.In the examples discussed above, the INTRAC unit 45 only receives aresponse from the resource tracker 50 after the INTRAC unit 45 sends aresource ISP query. The resource tracker 50 may instead update theresource table 43 whenever a subscriber begins or ends a session. Theresource table 43 for tracking the resources available for an accessserver or ISP can therefore be connected to the INTRAC unit 45, wherebythe INTRAC unit 45 would not query the RADIUS server 40′ and resourcetracker 50 to determine available network resources.

Data calls, as discussed above, pose a problem to the PSTN in that theyhave long call durations (LCDs) and consume valuable resources of thePSTN. The LECs experience another problem related to the routing of datacalls. The ISPs contend that they are another carrier and are entitledto an access charge for receiving the call from the LEC. Although thevalidity of this argument is in doubt, the LECs have been placing moneyinto a special account for each call connected to an ISP. A problem tothe LEC is that the calls to the ISP are always one-way whereby the LECscannot charge the ISPs for calls that terminate in the LECs network fromthe ISP.

The network 100 allows the LEC to redirect data calls off of the PSTN toan alternate interconnection arrangement. Through the arrangement shownin FIG. 3, LECs are now able to not only monitor and better manage callsto the ISPs, but can also meter the length of data calls to an ISP aswell as other data calls. Since each start and stop message sent to theRADIUS server 40′ is monitored by the resource tracker 50 and since eachstart or stop message identifies the caller as well as the ISP, theresource tracker 50 may track the total amount of time that calls wereconnected to an ISP. The resource tracker 50 can track the time in amultitude of ways. As one example, the resource tracker 50 effectivelyhas a timer associated with each call that is directed toward an ISP andstarts the timer in conjunction with decrementing the counter at step 84and stops the timer in conjunction with incrementing the counter at step86. The times associated with connections to an ISP can be stored in theresource table 43. Alternatively, rather than monitor actual time, theresource tracker 50, INTRAC unit 45, or access servers 22 may monitorthe actual payload delivered to the ISP. Furthermore, rather than theresource tracker 50 monitoring the time, the INTRAC unit 45 may monitorthe times associated with an ISP and store the times in the resourcetable 43.

The forgoing description of the preferred embodiments of the inventionhas been presented only for the purpose of illustration and descriptionand is not intended to be exhaustive or to limit the invention to theprecise forms disclosed. Many modifications and variations are possiblein light of the above teaching.

For example, the INTRAC unit 45 preferably resides on the SCP 42 and theresource tracker 50 resides on the RADIUS server 40′. The INTRAC unit 45and resource tracker 50, however, may comprise separate componentsdistinct from the RADIUS server 40′ and SCP 42.

As discussed above with reference to FIG. 4, when resources are notavailable to handle a subscriber's call, the call is terminated. Theinvention is not limited in the manner in which the call is terminated.The call, for instance, may be terminated by providing the calling partywith a busy signal. One possible way of providing this busy signal isdirecting the subscriber's call to a “dummy” port on the switch whichhas no trunk group. As another example, the calling party may be playedan announcement with this announcement informing the caller that the ISPor other entity that the caller is trying to reach is not able to acceptthe call.

The invention has been described primarily with reference to asubscriber's call directed to an ISP. The invention, however, is notlimited to calls directed to just an ISP but encompasses any data call.The invention, for instance, may be used to control and manage calls toa data network other than the Internet, such as a company's internalcomputer network The INTRAC unit 45, as discussed above, is preferablyco-resident with the LNP processing unit 104 on the same SCP 42. Byplacing the INTRAC unit 45 with the LNP processing unit 104, the LEC canreduce its cost and avoid the need to deploy a set of SCPs dedicated forrouting data calls separate from the set of SCPs that provide LNP callprocessing. The invention is not limited to any particular SCP. For anSCP that has both the LNP processing unit 104 and the INTRAC unit 45,the SCP 42 is preferably a Lucent SCP having a Release 6.9 or higher,such as the Starserver FT Model 3300, although any SCP that allows forthe use of Routing Keys with different Sub-System Numbers may be used.

The invention, moreover, is not limited to the PSTN but may be employedin other networks, such as a Private Branch Exchange (PBX). In a PBX,for instance, the INTRAC unit can intelligently route traffic to acertain destinations. The calls that are processed by the INTRAC unittherefore are not limited to just data calls but instead the INTRAC unitmay be used in the intelligent routing of voice or other types of calls.

The embodiments were chosen and described in order to explain theprinciples of the invention and their practical application so as toenable others skilled in the art to utilize the invention and variousembodiments and with various modifications as are suited to theparticular use contemplated.

1. A system for use in routing calls within a telephone network,comprising: a service control point for receiving a switch-generatedquery and for generating a resource query, the switch generated querybeing generated at a switch in response to a received call; and aresource tracker for tracking available resources of a first serviceprovider; wherein the resource tracker is for receiving the resourcequery from the service control point and is for providing routingdirections for routing the received call, the routing directions beingdelivered to the switch through the service control point.
 2. The systemas set forth in claim 1, wherein the routing directions generated by theresource tracker terminate the call when the first service provider hasno available resources.
 3. The system as set forth in claim 1, whereinthe routing directions generated by the resource tracker directs thereceived all to available resources of the first service provider. 4.The system as set forth in claim 1, wherein the resource trackerincludes a counter for tracking available resources of the first serviceprovider.
 5. The system as set forth in claim 1, wherein the resourcetracker includes a plurality of counters for tracking availableresources of the first service provider
 6. The system as set forth inclaim 5, wherein each of the counters in the resource tracker isassociated with a group of modems at the first service provider.
 7. Thesystem as set forth in claim 6, wherein the first service provider has aplurality of modems groups with each group of modems being dedicated todifferent types of service and the resource tracker having a pluralityof counters with each counter monitoring available resources of arespective group of modems.
 8. The system as set forth in claim 7,wherein the resource tracker is connected to a remote authenticationdial-in user service server.
 9. The system as set forth in claim 8,wherein the resource tracker monitors start and stop messages receivedat the remote authentication dial-in user service server.
 10. The systemas set forth in claim 1, wherein the resource tracker provides therouting directions as a local routing number.
 11. The system as setforth in claim 1, wherein the resource tracker resides on a remoteauthentication dial-in user service server.
 12. A method for routingcalls within a telephone network, comprising: receiving aswitch-generated query and generating a resource query; the switchgenerated query being generated at a switch in response to a receivedcall; tracking available resources of a first service provider; andproviding routing directions for routing the received call.
 13. Themethod as set forth in claim 12, wherein the tracking availableresources comprises tracking available resources of an Internet serviceprovider.
 14. The method as set forth in claim 12, wherein the trackingavailable resources comprises tracking available resources of a secondservice provider.
 15. The method as set forth in claim 12, wherein thetracking available resources comprises tracking available modems withineach of a plurality group of modems of the first service provider.
 16. Acomputer-readable medium having a program stored thereon for routingcalls within a telephone network, the program comprising: receiving aswitch-generated query and generating a resource query; the switchgenerated query being generated at a switch in response to a receivedcall; tracking available resources of a first service provider; andproviding routing directions for routing the received call.
 17. Thecomputer-readable medium as set forth in claim 17, the program furthercomprising monitoring a number of modems available at the first serviceprovider.
 18. The computer-readable medium as set forth in claim 17, theprogram further comprising: monitoring available resources of a secondservice provider; and providing routing directions for directing thereceived call to the second service provider when resources are notavailable at the first service provider.
 19. The computer-readablemedium as set forth in claim 17, the program further comprisinggenerating the routing directions based on a calling party's telephonenumber associated with the received call.
 20. The computer-readablemedium as set forth in claim as set forth in claim 17, the programfurther comprising generating the routing directions based on apreferred type of service for the received call.